484 ON THE FINS OF ELASMOBRANCHS. 



Fig. 5 Riglit side of pelvic cartilage of ditto. 



0, obturator foramen ; «, articular surface ; il, iliac process ; ip. ischio-pubic 



mass. 

 Fig. 6. Two spines of dorsal fin of Polypterus hichir, showing the secondary postaxiad 



rays. 

 Fig. 7. Left ventral fin of ditto. 

 Fig. 8. Anal fin of ditto. 



